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Monoclinic-orthorhombic phase transition in the K2MgSis012 leucite analog

SIMON A.T. REDFERN, C. MICHAEL B. HENDERSON

1996enmineralogyphase transitionleuciteelasticityX-ray diffraction

Abstract

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The high-temperature cell parameters of K2MgSis012 have been measured by X-ray powder diffraction between room temperature and 842 K. A first-order ferroelastic phase transition between the room-temperature P2/c structure and a high-temperature Pbca structure occurs at 622 K. The spontaneous strain behaves as the order parameter for the transition, following a simple Landau model. Simple lattice dynamics simulation of the magnesiosilicate framework reveals that acoustic mode softening drives the elastic instability. The first-order character of the transition is attributed to a large excess volume, which arises from collapse of the framework around the alkali site. At higher temperatures, the orthorhombic cell edges converge toward a metrically cubic structure, but this transformation requires Mg-Si disorder, which was not observed on the time scale of these experiments.

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Cite This Work

@article{ae3878f2-ce48-437f-9ad0-42a242392d8d,
  title={Monoclinic-orthorhombic phase transition in the K2MgSis012 leucite analog},
  author={SIMON A.T. REDFERN and C. MICHAEL B. HENDERSON},
  year={1996},
  language={en}
}
TY  - JOUR
TI  - Monoclinic-orthorhombic phase transition in the K2MgSis012 leucite analog
AU  - SIMON A.T. REDFERN
AU  - C. MICHAEL B. HENDERSON
PY  - 1996
LA  - en
ER  -

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